WASHINGTON -LRB- CNN -RRB- -- The United States temporarily closed its government facilities in South Africa on Tuesday after a `` possible threat '' to its embassy , the U.S. State Department said .

The U.S. Consulate in Johannesburg , South Africa , is among the American facilities closed Tuesday .

The U.S. Embassy in Pretoria and other government offices in South Africa will remain closed Wednesday as the security threat is being monitored , embassy spokeswoman Sharon Hudson-Dean said .

State Department spokesman Ian Kelly said the action was a precaution .

`` We are ... notifying the American community in South Africa to remain vigilant , '' Kelly said . `` We are also maintaining close contact with South African authorities on this issue . ''

He had no further details on the `` possible threat '' to the embassy in Pretoria .

A note on the embassy 's Web site said all U.S. government facilities in South Africa were temporarily closed following `` information recently received '' by regional security officials .

Kelly said the embassy 's Emergency Action Committee met and is formulating an appropriate course of action .

CNN 's Nkepile Mabuse and Elise Labott contributed to this report .

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NEW : U.S. Embassy in Pretoria , other offices will be closed additional day

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U.S. State Department spokesman calls temporary closings a precaution

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Americans in South Africa told to remain `` vigilant ''